Epidona is pyrimidinedione anticonvulsant. The active metabolites of primidone namely, phenobarbital and phenylethylmalonamide are also used as anticonvulsants. The drug is brought in use to treat simple partials, complex partial, myoclonic, akenetics and even essential tremor. Unlike other anticonvulsant, it is not brought in much use for treating the patients of bipolar disorder or other psychiatric problems. It even helps in decreasing the renal excretion.